diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index 2b07b74..a5385eb 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -738,8 +738,9 @@
  *   `PSA_ECC_CURVE_CURVEXXX`), and in big-endian order for Weierstrass
  *   curves (curve types `PSA_ECC_CURVE_SECTXXX`, `PSA_ECC_CURVE_SECPXXX`
  *   and `PSA_ECC_CURVE_BRAINPOOL_PXXX`).
- *   This is the content of the `privateKey` field of the `ECPrivateKey`
- *   format defined by RFC 5915.
+ *   For Weierstrass curves, this is the content of the `privateKey` field of
+ *   the `ECPrivateKey` format defined by RFC 5915.  For Montgomery curves,
+ *   the format is defined by RFC 7748, and output is masked according to §5.
  * - For Diffie-Hellman key exchange key pairs (key types for which
  *   #PSA_KEY_TYPE_IS_DH_KEY_PAIR is true), the
  *   format is the representation of the private key `x` as a big-endian byte
diff --git a/tests/suites/test_suite_psa_crypto.data b/tests/suites/test_suite_psa_crypto.data
index ae175e4..d2428a0 100644
--- a/tests/suites/test_suite_psa_crypto.data
+++ b/tests/suites/test_suite_psa_crypto.data
@@ -220,6 +220,22 @@
 depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_BP512R1_ENABLED
 import_export_public_key:"372c9778f69f726cbca3f4a268f16b4d617d10280d79a6a029cd51879fe1012934dfe5395455337df6906dc7d6d2eea4dbb2065c0228f73b3ed716480e7d71d2":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_CURVE_BRAINPOOL_P_R1):PSA_ALG_ECDSA_ANY:0:PSA_SUCCESS:"0438b7ec92b61c5c6c7fbc28a4ec759d48fcd4e2e374defd5c4968a54dbef7510e517886fbfc38ea39aa529359d70a7156c35d3cbac7ce776bdb251dd64bce71234424ee7049eed072f0dbc4d79996e175d557e263763ae97095c081e73e7db2e38adc3d4c9a0487b1ede876dc1fca61c902e9a1d8722b8612928f18a24845591a"
 
+PSA import/export EC curve25519 key pair: good (already properly masked)
+depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+import_export:"70076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c6a":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_CURVE_MONTGOMERY):PSA_KEY_USAGE_EXPORT:PSA_ALG_ECDH:255:0:PSA_SUCCESS:1
+
+PSA import/export EC curve25519 key pair: unmasked input (check export-import-export yields properly masked output)
+depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+import_export:"77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_CURVE_MONTGOMERY):PSA_KEY_USAGE_EXPORT:PSA_ALG_ECDH:255:0:PSA_SUCCESS:0
+
+PSA import/export-public EC curve25519: accept unmasked input
+depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+import_export_public_key:"77076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c2a":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_CURVE_MONTGOMERY):PSA_ALG_ECDH:0:PSA_SUCCESS:"8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a"
+
+PSA import/export-public EC curve25519: accept masked input
+depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+import_export_public_key:"70076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c6a":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_CURVE_MONTGOMERY):PSA_ALG_ECDH:0:PSA_SUCCESS:"8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a"
+
 PSA import/export-public: cannot export-public a symmetric key
 depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:MBEDTLS_RSA_C
 import_export_public_key:"2b7e151628aed2a6abf7158809cf4f3c":PSA_KEY_TYPE_AES:PSA_ALG_CBC_NO_PADDING:0:PSA_ERROR_INVALID_ARGUMENT:""